Pseudomyrmex ants live exclusively in the swollen thorns of acacia trees. In return for food and shelter provided by the trees, the ants aggressively defend the tree from leaf-eating insects. This interaction between ants and acacias represents an example of

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#Question id: 5730

#Unit 8. Inheritance Biology

In a family, father is homozygous dominant (AA) for a gene A and his wife is homozygous for its ressive allele (aa) showing albino phenotype. It was surprising that their child showed the albino phenotype. Which of the following phenomenon can explain the phenotype?

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#Question id: 12433

#Unit 10. Ecological Principles

The Hubbard Brook watershed deforestation experiment yielded all of the following results except that

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#Question id: 12588

#Unit 10. Ecological Principles

According to the equilibrium model of island biogeography, species richness would be greatest on an island that is

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#Question id: 31219

#Unit 4. Cell Communication and Cell Signaling

The intrinsic apoptosis pathway is mediated by an activated initiator caspase:

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#Question id: 4708

#Unit 11. Evolution and Behavior

The following questions refer to the figure below, which shows an outcrop of sedimentary rock whose strata are labeled A-D. If x indicates the fossils of two closely related species, neither of which is extinct, then their remains may be found in how many of these strata?